CN112798082B - Online calibration method and online calibration equipment for precession flowmeter - Google Patents

Online calibration method and online calibration equipment for precession flowmeter Download PDF

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CN112798082B
CN112798082B CN202110030570.5A CN202110030570A CN112798082B CN 112798082 B CN112798082 B CN 112798082B CN 202110030570 A CN202110030570 A CN 202110030570A CN 112798082 B CN112798082 B CN 112798082B
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flowmeter
verification
flow
calibration
error
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CN112798082A (en
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徐峰
刘建兵
钱寿琴
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Jiangsu Micro Wave Electronic Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters

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Abstract

The invention discloses an online calibration method and online calibration equipment for a precession flowmeter, comprising the following steps of 1, temperature transmitter calibration: the invention discloses a method for calibrating a temperature transmitter, which comprises the steps of confirming the measuring range of the calibrated temperature transmitter and the temperature measuring range in a parameter setting list, using a standard temperature sensor to calibrate according to JJF1183 temperature transmitter calibration standards after confirming that the upper limit and the lower limit of the temperature measuring range are consistent, and carrying out the next step after the calibration is finished. According to the online calibration method and the online calibration device for the vortex shedding flowmeter, the flow is obtained by measuring the frequency and other parameters generated by the vortex shedding generator, the accuracy of the vortex shedding flowmeter is verified on the basis of not disassembling the flowmeter, the accuracy is verified through online calibration in daily production, and the problems that the flowmeter cannot be disassembled for inspection and damage in the inspection process is prevented due to continuous production are solved.

Description

Online calibration method and online calibration equipment for precession flowmeter
Technical Field
The invention relates to the technical field of flowmeter online calibration, in particular to an online calibration method and online calibration equipment for a precession flowmeter.
Background
The precession flowmeter needs to have a periodic data storage function and a parameter recording function to realize online calibration and detection. When the vortex generating body is in operation, the frequency sensing piece is normal, the pressure and temperature sensors are normal, and the processing, calculation and display capabilities of the circuit board are normal. It can be determined that the meter measurement is functioning properly.
The existing precession flowmeter needs to be disassembled to detect when detecting, but the existing detection cannot be disassembled for flow meter inspection due to continuous production and is easy to damage in the inspection process, thereby wasting time and labor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an online calibration method and online calibration equipment for a precession flowmeter, which solve the problems that the flowmeter cannot be disassembled for inspection due to continuous production in the existing inspection, and the flowmeter is easy to damage in the inspection process, wastes time and labor.
In order to achieve the purpose, the invention is realized by the following technical scheme: an online calibration method for a precession flowmeter, comprising the steps of:
step 1, calibrating a temperature transmitter: confirming the measuring range of the temperature transmitter to be calibrated and the temperature measuring range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature measuring range are consistent, calibrating by using a standard temperature sensor (a temperature calibrator) according to the JJF1183 temperature transmitter calibration standard, and carrying out the next step after the calibration is finished;
step 2, calibrating the pressure transmitter: confirming the range of the pressure transmitter to be calibrated and the pressure range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature range are consistent, using a standard pressure gauge (a pressure check meter) to calibrate according to the verification rule of the JJG882 pressure transmitter, and carrying out the next step after the calibration is finished;
step 3, calibrating a circuit board (flow integrating instrument): observing whether the display of the liquid crystal screen is normal, giving a standard frequency signal by using a signal generator, giving a fixed pressure by using a standard pressure calibrator, inputting the ambient temperature by using a standard temperature calibrator, observing whether the display numerical value on the liquid crystal screen is normal or not, adjusting different input frequencies and different pressures, observing whether the processing and calculating capacity of a circuit is normal or not, and confirming whether the calculation and displaying capacity of a circuit board is normal or not;
step 4, comprehensive item calibration: place the top of check out test set in the check out test set with the oscillation frequency generator, close the baffle, rotate the dwang, drive the limiting plate butt on the surface of baffle, fix the oscillation frequency generator, then rotate the adjusting plate and drive the regulation pole and follow the inside screw-out of butt piece, reset spring resets the inflation and drives the both sides that the butt piece extrudees at the oscillation frequency generator, carry on spacingly, then hang the surface at the flowmeter with the couple circle, rotate the rotation circle, it rotates the threaded rod and rotates, the threaded rod rotates and drives the lifter plate upward movement, drive spacing arc upward movement, grasp the flowmeter, make the oscillation frequency generator extrude the bottom at the flowmeter, then adjust the test mode with the circuit board. Adjusting frequency (flow) calibration points, respectively recording natural frequency Fn of an oscillation frequency generator and measuring frequency Fn of an instrument after the frequency (flow) of the flowmeter is indicated to be stable for 30 seconds, calculating the error between the natural frequency Fn and the measuring frequency Fn, selecting 3-5 frequency (flow) calibration points, repeating the frequency (flow) calibration points for at least three times at each point, respectively recording the error value of each measurement, and calculating the indicating error and the repeatability of the frequency (flow) of the flowmeter;
and 5, data processing: calculating the indicating value error of the flow meter which is detected at the ith detection flow point for the jth detection, wherein the indicating value error of the flow meter which is detected at the ith detection flow point for the jth detection is calculated according to the following formula;
Figure 984452DEST_PATH_IMAGE001
in the formula:
Eij-cumulative volume flow relative indication error in units of volume flow measured at jth verification flow point of ith verification flow point;
Qij-carrying out mth verification on the ith verification flow point and measuring the accumulated working condition volume flow of the flowmeter verified at the jth verification flow point in a unit of m;
(Qs)ijconverting the working condition accumulated volume flow rate given by the ith verification flow rate point jth verification device into the working condition accumulated volume flow rate of the flowmeter in an m-th verification unit;
for gas flow meters, (Q)s)ijCalculating according to the following formula;
Figure 536263DEST_PATH_IMAGE002
in the formula:
T s T m the gas temperature of the working condition of the device and the working condition of the flowmeter of the jth verification flow point is K;
P s,P m -device condition and flowmeter condition absolute pressure for jth verification of ith verification flow point in units of Pa；
(V s ) ij -carrying out mth verification on the ith verification flow point and the jth verification on the working condition accumulated flow of the device in the unit of m;
z s, zm-verifying a device condition and a flowmeter condition gas compression factor for the ith verification flow point for the jth verification;
when the pressure difference between the device and the flowmeter is less than 1 atmospheric pressure, z s =zm；
Q ij Calculated according to the following formula。
Figure 468447DEST_PATH_IMAGE003
In the formula:
K-the K-factor of the flow meter;
N ij -number of flowmeter output pulses of jth verification of ith verification flow point;
the indicating value error of the flowmeter of the ith verification flow point;
the flow meter indicating error of the ith verification flow point is calculated according to the following formula;
Figure 16103DEST_PATH_IMAGE004
in the formula:
E i -a first stepiDetecting the error of the relative indication value of the accumulated volume flow of the working condition of the flowmeter at the flow point, wherein the unit is;
n-a first stepiDetecting the detection times of the flow points;
error in indicating value of flowmeterE；
The liquid flowmeter takes the maximum absolute value of the indicating error of all the verification flow points as the indicating error of the flowmeter;
gas flow meter for taking high area Q respectivelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the absolute value of the indicating value error of the flowmeter of each verification flow point in the flow range is respectively used as the indicating value error of the flowmeter of a high area and a low area;
flow meter repeatability of ith verification flow point
Figure 966610DEST_PATH_IMAGE005
The flow meter repeatability of the ith verification flow point is calculated according to the following formula;
in the formula:
(Er)ifirst, theiVerifying the flowmeter repeatability of the flow point j times, wherein the unit is;
step 6, repeatability E of the flowmeter t Selecting: for the liquid flowmeter, taking the repeatability maximum value of all the verification flow points as the repeatability of the flowmeter;
for gas flow meters, the high regions Q are taken separatelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the flowmeter repeatability of each verification flow point in the flow range is respectively used as the flowmeter repeatability of the high area and the low area;
and 7, expressing a calibration result: and issuing calibration data, and determining a re-calibration time interval according to the calibration result of the flowmeter and the actual condition of the production working condition.
The invention also discloses online calibration equipment of the precession flowmeter, which comprises detection equipment, wherein the detection equipment comprises a detection frame, the top of the detection frame is fixedly connected with a connecting block, the top of the connecting block is fixedly connected with a hook ring, an inner cavity of the hook ring is provided with a movable groove, one side of the movable groove is connected with a lifting plate in a sliding way, one side of the lifting plate penetrates through one side of the movable groove and extends to the other side of the movable groove, the back of the hook ring is fixedly connected with a top plate, the top of the top plate is rotatably connected with a threaded rod, one end of the threaded rod sequentially penetrates through the top plate and the lifting plate from top to bottom and extends to the lower part of the lifting plate, the surface of the threaded rod is in threaded connection with the inner cavity of the lifting plate, the bottom end of the threaded rod is rotatably connected with the top of the connecting block, the top end of the threaded rod is fixedly connected with a rotating ring, one side of the lifting plate is fixedly connected with a limiting arc plate, the bottom threaded connection of lifter plate has the butt bolt, the top of butt bolt runs through the bottom of lifter plate and extends to the top of lifter plate, the top fixedly connected with kicking block of butt bolt.
As a further scheme of the invention: the inner chamber swing joint of detection frame has the oscillation frequency generator, the surface of detection frame is rotated through the hinge and is connected with the baffle, the surface of detection frame is rotated and is connected with the dwang, the fixed surface of dwang is connected with the limiting plate, the surface butt of the surface of limiting plate and baffle.
As a further scheme of the invention: one side fixedly connected with of detection frame links the piece, link one side fixedly connected with reset spring of piece, reset spring keeps away from one side fixedly connected with butt piece even piece, the surface of butt piece and oscillation frequency generator's surperficial butt, one side of detection frame is rotated and is connected with the regulation pole, the one end of adjusting the pole is run through the surface of butt piece and is extended to the inner chamber of butt piece, the surface of adjusting the pole and the inner chamber threaded connection of butt piece, the fixed surface of adjusting the pole is connected with the adjustment disc.
Advantageous effects
The invention provides an online calibration method and online calibration equipment for a precession flowmeter. Compared with the prior art, the method has the following beneficial effects:
1. an on-line calibration method and an on-line calibration device for a precession flowmeter are characterized in that an oscillation frequency generator is placed at the top of a detection frame in a detection device, a baffle plate is closed, a rotating rod is rotated to drive a limiting plate to be abutted against the surface of the baffle plate, the oscillation frequency generator is fixed, then a regulating disc is rotated to drive a regulating rod to be screwed out of an abutting block, a reset spring is reset and expanded to drive the abutting block to be extruded at two sides of the oscillation frequency generator for limiting, a hook ring is hung on the surface of the flowmeter, the rotating ring is rotated to drive a threaded rod to rotate, the threaded rod is rotated to drive a lifting plate to move upwards to drive a limiting arc-shaped plate to move upwards, the flowmeter is clamped, the oscillation frequency generator is extruded at the bottom of the flowmeter, then a circuit board is regulated to a test mode, a frequency (flow rate) calibration point is regulated, and after the frequency (flow rate) of the flowmeter is stably indicated for 30 seconds, recording the natural frequency Fn of the oscillation frequency generator and the measuring frequency Fn of the instrument respectively, calculating the error between the natural frequency Fn and the measuring frequency Fn, selecting 3-5 frequency (flow) calibration points, repeating at least three times at each point, recording the error value of each measurement, calculating the indicating error and repeatability of the frequency (flow) of the flowmeter, obtaining the flow by measuring the frequency and other parameters generated by the vortex shedding generator, verifying the accuracy of the vortex shedding flowmeter on the basis of not disassembling the flowmeter, verifying the accuracy by on-line calibration in daily production, and solving the problems that the flowmeter cannot be disassembled for inspection due to continuous production, preventing damage in the inspection process and the like.
2. An online calibration method and online calibration equipment for a precession flowmeter, which comprises a detection frame, wherein the top of the detection frame is fixedly connected with a connecting block, the top of the connecting block is fixedly connected with a hook ring, the inner cavity of the hook ring is provided with a movable groove, one side of the movable groove is slidably connected with a lifting plate, one side of the lifting plate penetrates through one side of the movable groove and extends to the other side of the movable groove, the back of the hook ring is fixedly connected with a top plate, the top of the top plate is rotatably connected with a threaded rod, one end of the threaded rod sequentially penetrates through the top plate and the lifting plate from top to bottom and extends to the lower part of the lifting plate, the surface of the threaded rod is in threaded connection with the inner cavity of the lifting plate, the bottom end of the threaded rod is rotatably connected with the top of the connecting block, the top of the threaded rod is fixedly connected with a rotating ring, one side of the lifting plate is fixedly connected with a limiting arc plate, and the bottom of the lifting plate is in threaded connection with a butt bolt, the top end of the butt bolt penetrates through the bottom of the lifting plate and extends to the top end of the lifting plate, the top end of the butt bolt is fixedly connected with a top block, an inner cavity of the detection frame is movably connected with an oscillation frequency generator, the surface of the detection frame is rotatably connected with a baffle plate through a hinge, the surface of the detection frame is rotatably connected with a rotating rod, the surface of the rotating rod is fixedly connected with a limiting plate, the surface of the limiting plate is abutted against the surface of the baffle plate, one side of the detection frame is fixedly connected with a connecting block, one side of the connecting block is fixedly connected with a reset spring, one side of the reset spring, which is far away from the connecting block, is fixedly connected with a butting block, the surface of the butting block is abutted against the surface of the oscillation frequency generator, one side of the detection frame is rotatably connected with an adjusting rod, one end of the adjusting rod penetrates through the surface of the butting block and extends to the inner cavity of the butting block, the surface of the adjusting rod is in threaded connection with the inner cavity of the butting block, the surface of the adjusting rod is fixedly connected with an adjusting disk, hang the couple circle on the surface of flowmeter, rotate and rotate the circle, drive the threaded rod and rotate, the threaded rod rotates and drives the lifter plate upward movement, drives spacing arc upward movement, grasps the flowmeter for the oscillation frequency generator extrusion is in the bottom of flowmeter, and can be quick fix the oscillation frequency generator, detects more accurately.
Drawings
FIG. 1 is a schematic view of the external structure of the detecting device of the present invention;
FIG. 2 is a side view of the construction of the hook ring of the present invention;
fig. 3 is a partial enlarged view of the invention at a in fig. 1.
In the figure: 1. a detection frame; 2. connecting blocks; 3. hooking a ring; 4. a movable groove; 5. a lifting plate; 6. a top plate; 7. a threaded rod; 8. rotating the ring; 9. a limiting arc plate; 10. an abutment bolt; 11. a top block; 12. an oscillation frequency generator; 13. a baffle plate; 14. rotating the rod; 15. a limiting plate; 16. a return spring; 17. a butting block; 18. adjusting a rod; 19. and (4) adjusting a disc.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides the following technical solutions: an online calibration method for a precession flowmeter, comprising the steps of:
step 1, calibrating a temperature transmitter: confirming the measuring range of the temperature transmitter to be calibrated and the temperature measuring range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature measuring range are consistent, calibrating by using a standard temperature sensor (a temperature calibrator) according to the JJF1183 temperature transmitter calibration standard, and carrying out the next step after the calibration is finished;
step 2, calibrating the pressure transmitter: confirming the range of the pressure transmitter to be calibrated and the pressure range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature range are consistent, using a standard pressure gauge (a pressure check meter) to calibrate according to the verification rule of the JJG882 pressure transmitter, and carrying out the next step after the calibration is finished;
step 3, calibrating a circuit board (flow integrating instrument): observing whether the display of the liquid crystal screen is normal, giving a standard frequency signal by using a signal generator, giving a fixed pressure by using a standard pressure calibrator, inputting the ambient temperature by using a standard temperature calibrator, observing whether the display numerical value on the liquid crystal screen is normal or not, adjusting different input frequencies and different pressures, observing whether the processing and calculating capacity of a circuit is normal or not, and confirming whether the calculation and displaying capacity of a circuit board is normal or not;
step 4, comprehensive item calibration: place oscillation frequency generator 12 in the check out test set top of test jig 1, close baffle 13, rotate dwang 14, drive limiting plate 15 butt on the surface of baffle 13, fix oscillation frequency generator 12, then rotate adjusting disk 19 and drive adjusting rod 18 and screw out from butt block 17, reset spring 16 resets the inflation and drives butt block 17 and extrude the both sides at oscillation frequency generator 12, carry out spacingly, then hang couple ring 3 on the surface of flowmeter, rotate turning ring 8, drive threaded rod 7 and rotate, threaded rod 7 rotates and drives lifter plate 5 upward movement, drive spacing arc 9 upward movement, clamp the flowmeter, make oscillation frequency generator 12 extrude the bottom at the flowmeter, then adjust the test mode with the circuit board. Adjusting frequency (flow) calibration points, respectively recording natural frequency Fn of an oscillation frequency generator and measuring frequency Fn of an instrument after the frequency (flow) of the flowmeter is indicated to be stable for 30 seconds, calculating the error between the natural frequency Fn and the measuring frequency Fn, selecting 3-5 frequency (flow) calibration points, repeating the frequency (flow) calibration points for at least three times at each point, respectively recording the error value of each measurement, and calculating the indicating error and the repeatability of the frequency (flow) of the flowmeter;
and 5, data processing: calculating the indicating value error of the flow meter which is detected at the ith detection flow point for the jth detection, wherein the indicating value error of the flow meter which is detected at the ith detection flow point for the jth detection is calculated according to the following formula;
Figure 207099DEST_PATH_IMAGE006
in the formula:
Eij-cumulative volume of meter measurement conditions verified at jth verification flow pointRelative indication error of flow in units of%;
Qij-carrying out mth verification on the ith verification flow point and measuring the accumulated working condition volume flow of the flowmeter verified at the jth verification flow point in a unit of m;
(Qs)ijconverting the working condition accumulated volume flow rate given by the ith verification flow rate point jth verification device into the working condition accumulated volume flow rate of the flowmeter in an m-th verification unit;
for gas flow meters, (Q)s)ijCalculating according to the following formula;
Figure 626579DEST_PATH_IMAGE002
in the formula:
T s T m the gas temperature of the working condition of the device and the working condition of the flowmeter of the jth verification flow point is K;
P s,P m -verifying the device working condition and the flowmeter working condition absolute pressure of the flow point ith verification for the jth time in Pa;
(V s ) ij -carrying out mth verification on the ith verification flow point and the jth verification on the working condition accumulated flow of the device in the unit of m;
z s, zm-verifying a device condition and a flowmeter condition gas compression factor for the ith verification flow point for the jth verification;
when the pressure difference between the device and the flowmeter is less than 1 atmospheric pressure, z s =zm；
Q ij Calculated according to the following formula.
Figure 463079DEST_PATH_IMAGE003
In the formula:
K-the K-factor of the flow meter;
N ij -number of flowmeter output pulses of jth verification of ith verification flow point;
the indicating value error of the flowmeter of the ith verification flow point;
the flow meter indicating error of the ith verification flow point is calculated according to the following formula;
Figure 284404DEST_PATH_IMAGE004
in the formula:
E i -a first stepiDetecting the error of the relative indication value of the accumulated volume flow of the working condition of the flowmeter at the flow point, wherein the unit is;
n-a first stepiDetecting the detection times of the flow points;
error in indicating value of flowmeterE；
The liquid flowmeter takes the maximum absolute value of the indicating error of all the verification flow points as the indicating error of the flowmeter;
gas flow meter for taking high area Q respectivelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the absolute value of the indicating value error of the flowmeter of each verification flow point in the flow range is respectively used as the indicating value error of the flowmeter of a high area and a low area;
flow meter repeatability of ith verification flow point
Figure 695794DEST_PATH_IMAGE005
The flow meter repeatability of the ith verification flow point is calculated according to the following formula;
in the formula:
(Er)ifirst, theiVerifying the flowmeter repeatability of the flow point j times, wherein the unit is;
step 6, repeatability E of the flowmeter t Selecting: for the liquid flowmeter, taking the repeatability maximum value of all the verification flow points as the repeatability of the flowmeter;
for gas flow meters, the high regions Q are taken separatelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the flowmeter repeatability of each verification flow point in the flow range is respectively used as the flowmeter repeatability of the high area and the low area;
and 7, expressing a calibration result: the method comprises the steps of providing calibration data, determining a re-calibration time interval according to a calibration result of the flowmeter and the actual condition of a production working condition, obtaining flow by measuring parameters such as frequency generated by a vortex shedding generator, verifying the accuracy of the vortex shedding flowmeter on the basis of not disassembling the flowmeter, and solving the problems that the flowmeter cannot be disassembled in continuous production, the flowmeter cannot be disassembled in inspection, the flowmeter cannot be prevented from being damaged in the inspection process and the like by on-line calibration verification in daily production.
The invention also discloses online calibration equipment of the precession flowmeter, which comprises detection equipment, wherein the detection equipment comprises a detection frame 1, the top of the detection frame 1 is fixedly connected with a connecting block 2, the top of the connecting block 2 is fixedly connected with a hook ring 3, an inner cavity of the hook ring 3 is provided with a movable groove 4, one side of the movable groove 4 is slidably connected with a lifting plate 5, one side of the lifting plate 5 penetrates through one side of the movable groove 4 and extends to the other side of the movable groove 4, the back of the hook ring 3 is fixedly connected with a top plate 6, the top of the top plate 6 is rotatably connected with a threaded rod 7, one end of the threaded rod 7 sequentially penetrates through the top plate 6 and the lifting plate 5 from top to bottom and extends to the lower part of the lifting plate 5, the surface of the threaded rod 7 is in threaded connection with the inner cavity of the lifting plate 5, the bottom end of the threaded rod 7 is rotatably connected with the top of the connecting block 2, the top end of the threaded rod 7 is fixedly connected with a rotating ring 8, one side of the lifting plate 5 is fixedly connected with a limiting arc 9, the bottom of the lifting plate 5 is in threaded connection with an abutting bolt 10, the top end of the abutting bolt 10 penetrates through the bottom of the lifting plate 5 and extends to the top end of the lifting plate 5, the top end of the abutting bolt 10 is fixedly connected with a top block 11, the inner cavity of the detection frame 1 is movably connected with an oscillation frequency generator 12, the surface of the detection frame 1 is rotatably connected with a baffle 13 through a hinge, the surface of the detection frame 1 is rotatably connected with a rotating rod 14, the surface of the rotating rod 14 is fixedly connected with a limiting plate 15, the surface of the limiting plate 15 is abutted against the surface of the baffle 13, one side of the detection frame 1 is fixedly connected with a connecting block, one side of the connecting block is fixedly connected with a reset spring 16, one side of the reset spring 16 far away from the connecting block is fixedly connected with an abutting block 17, the surface of the abutting block 17 is abutted against the surface of the oscillation frequency generator 12, one side of the detection frame 1 is rotatably connected with an adjusting rod 18, adjust the one end of pole 18 and run through the surface of butt joint piece 17 and extend to the inner chamber of butt joint piece 17, adjust the surface of pole 18 and the inner chamber threaded connection of butt joint piece 17, adjust the fixed surface of pole 18 and be connected with adjustment disk 19, hang couple ring 3 on the surface of flowmeter, rotate and rotate circle 8, it rotates to drive threaded rod 7, threaded rod 7 rotates and drives 5 upward movement of lifter plate, drive spacing arc 9 upward movement, hold the flowmeter, make oscillation frequency generator 12 extrude the bottom at the flowmeter, can be quick fix oscillation frequency generator 12, it is more accurate to detect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (2)

1. An online calibration method for a precession flowmeter is characterized by comprising the following steps: the method comprises the following steps:
step 1, calibrating a temperature transmitter: confirming the measuring range of the temperature transmitter to be calibrated and the temperature measuring range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature measuring range are consistent, calibrating by using a standard temperature sensor according to the JJF1183 temperature transmitter calibration standard, and carrying out the next step after the calibration is finished;
step 2, calibrating the pressure transmitter: confirming the range of the calibrated pressure transmitter and the pressure range in the parameter setting list, after confirming that the upper limit and the lower limit of the temperature range are consistent, calibrating according to the verification rule of the JJG882 pressure transmitter by using a standard pressure gauge, and performing the next step after the calibration is finished;
step 3, calibrating the circuit board: observing whether the display of the liquid crystal screen is normal, giving a standard frequency signal by using a signal generator, giving a fixed pressure by using a standard pressure calibrator, inputting the ambient temperature by using a standard temperature calibrator, observing whether the display numerical value on the liquid crystal screen is normal or not, adjusting different input frequencies and different pressures, observing whether the processing and calculating capacity of a circuit is normal or not, and confirming whether the calculation and displaying capacity of a circuit board is normal or not;
step 4, comprehensive item calibration: placing an oscillation frequency generator (12) at the top of a detection frame (1) in detection equipment, closing a baffle (13), rotating a rotating rod (14) to drive a limiting plate (15) to abut against the surface of the baffle (13), fixing the oscillation frequency generator (12), then rotating a regulating disc (19) to drive a regulating rod (18) to unscrew from an abutting block (17), resetting and expanding a reset spring (16) to drive the abutting block (17) to extrude at two sides of the oscillation frequency generator (12) for limiting, then hanging a hook ring (3) on the surface of a flowmeter, rotating a rotating ring (8) to drive a threaded rod (7) to rotate, rotating the threaded rod (7) to drive a lifting plate (5) to move upwards to drive a limiting arc plate (9) to move upwards to clamp the flowmeter, so that the oscillation frequency generator (12) extrudes at the bottom of the flowmeter, and then regulating a circuit board to a test mode, adjusting frequency calibration points, respectively recording natural frequency Fn of an oscillation frequency generator and instrument measurement frequency Fn after the frequency indication of the flowmeter is stable for 30 seconds, calculating the error between the natural frequency Fn and the instrument measurement frequency Fn, selecting 3-5 frequency calibration points, repeating the frequency calibration points at least three times at each point, respectively recording the error value of each measurement, and calculating the indication error and repeatability of the flowmeter frequency;
and 5, data processing: calculating the indicating error of the flow meter of the jth verification of the ith verification flow point, wherein the indicating error of the flow meter of the jth verification of the ith verification flow point is calculated according to the following formula:
Figure DEST_PATH_IMAGE001
in the formula:
Eij-cumulative volume flow relative indication error in units of volume flow measured at jth verification flow point of ith verification flow point;
Qij-carrying out mth verification on the ith verification flow point and measuring the accumulated working condition volume flow of the flowmeter verified at the jth verification flow point in a unit of m;
(Qs)ijconverting the working condition accumulated volume flow rate given by the ith verification flow rate point jth verification device into the working condition accumulated volume flow rate of the flowmeter in an m-th verification unit;
for gas flow meters, (Q)s)ijCalculating according to the following formula;
Figure 76066DEST_PATH_IMAGE002
in the formula:
T s, T m the gas temperature of the working condition of the device and the working condition of the flowmeter of the jth verification flow point is K;
p s,p m -verifying the device working condition and the flowmeter working condition absolute pressure of the flow point ith verification for the jth time in Pa;
(V s ) ij -carrying out mth verification on the ith verification flow point and the jth verification on the working condition accumulated flow of the device in the unit of m;
z s, zm-verifying a device condition and a flowmeter condition gas compression factor for the ith verification flow point for the jth verification;
when the pressure difference between the device and the flowmeter is less than 1 atmospheric pressure, z s =zm；
Q ij Calculated according to the following formula:
Figure DEST_PATH_IMAGE003
in the formula:
K-the K-factor of the flow meter;
N ij -number of flowmeter output pulses of jth verification of ith verification flow point;
the indicating value error of the flowmeter of the ith verification flow point;
the flow meter indicating error of the ith verification flow point is calculated according to the following formula;
Figure 771096DEST_PATH_IMAGE004
in the formula:
E i -a first stepiDetecting the error of the relative indication value of the accumulated volume flow of the working condition of the flowmeter at the flow point, wherein the unit is;
n-a first stepiDetecting the detection times of the flow points;
error in indicating value of flowmeterE；
The liquid flowmeter takes the maximum absolute value of the indicating error of all the verification flow points as the indicating error of the flowmeter;
gas flow meter for taking high area Q respectivelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the absolute value of the indicating value error of the flowmeter of each verification flow point in the flow range is respectively used as the indicating value error of the flowmeter of a high area and a low area;
detecting the flow meter repeatability of the flow point;
the flow meter repeatability of the ith verification flow point is calculated according to the following formula;
Figure DEST_PATH_IMAGE005
in the formula:
(Er)ifirst, theiVerifying the flowmeter repeatability of the flow point j times, wherein the unit is;
step 6, repeatability E of the flowmeter t Selecting: for the liquid flowmeter, taking the repeatability maximum value of all the verification flow points as the repeatability of the flowmeter;
for gas flow meters, the high regions Q are taken separatelyt≤Q≤QmaxAnd low region Qmin≤Q≤QtThe maximum value of the flowmeter repeatability of each verification flow point in the flow range is respectively used as the flowmeter repeatability of the high area and the low area;
and 7, expressing a calibration result: and issuing calibration data, and determining a re-calibration time interval according to the calibration result of the flowmeter and the actual condition of the production working condition.
2. An online calibration device of a precession flowmeter, characterized in that: comprises a detection device, the detection device comprises a detection frame (1), the top of the detection frame (1) is fixedly connected with a connecting block (2), the top of the connecting block (2) is fixedly connected with a hook ring (3), the inner cavity of the hook ring (3) is provided with a movable groove (4), one side of the movable groove (4) is slidably connected with a lifting plate (5), one side of the lifting plate (5) penetrates through one side of the movable groove (4) and extends to the other side of the movable groove (4), the back of the hook ring (3) is fixedly connected with a top plate (6), the top of the top plate (6) is rotatably connected with a threaded rod (7), one end of the threaded rod (7) sequentially penetrates through the top plate (6) and the lifting plate (5) from top to bottom and extends to the lower part of the lifting plate (5), the surface of the threaded rod (7) is in threaded connection with the inner cavity of the lifting plate (5), the bottom of threaded rod (7) is rotated with the top of connecting block (2) and is connected, the top fixedly connected with of threaded rod (7) rotates circle (8), the spacing arc (9) of one side fixedly connected with of lifter plate (5), the bottom threaded connection of lifter plate (5) has butt bolt (10), the top of butt bolt (10) runs through the bottom of lifter plate (5) and extends to the top of lifter plate (5), the top fixedly connected with kicking block (11) of butt bolt (10), the inner chamber swing joint of detection frame (1) has oscillation frequency generator (12), the surface of detection frame (1) is connected with baffle (13) through the hinge rotation, the surface rotation of detection frame (1) is connected with dwang (14), the surface fixed connection of dwang (14) has limiting plate (15), the surperficial butt with the surface of baffle (13) of limiting plate (15), one side fixedly connected with of detection frame (1) links the piece, link one side fixedly connected with reset spring (16) of piece, reset spring (16) keep away from one side fixedly connected with butt piece (17) of linking the piece, the surperficial butt with the surface butt of oscillation frequency generator (12) of butt piece (17), one side of detecting frame (1) is rotated and is connected with regulation pole (18), the one end of adjusting pole (18) is run through the surface of butt piece (17) and is extended to the inner chamber of butt piece (17), the surface of adjusting pole (18) and the inner chamber threaded connection of butt piece (17), the surperficial fixedly connected with adjustment disc (19) of regulation pole (18).
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